Unlike commercial operating systems such as Windows or Mac OS X, Linux stands alone because of its unique nature. One of the major benefits of using this OS is that it is open source, meaning that the underlying source code may be used, modified, and distributed as its users see fit.
There are very specialized flavors of Linux such as Bedrock, which can utilize the benefits of various other Linux distributions. Then there are companies like SuSE that provide enterprise-grade Linux for those, mainly corporations, looking for a high degree of stability in server functionality.
But why is it that a higher percentage of bitcoin enthusiasts in China than anywhere else seem to use Linux to download the bitcoin client (Bitcoin QT)?